Better error message if new VM Name starts with illegal characters

[alimirjamali]

Fixes: QubesOS/qubes-issues#7234

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 69.35%. Comparing base (3362ffc) to head (51a425b).
Report is 5 commits behind head on main.

Files	Patch %	Lines
qubes/vm/__init__.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #606   +/-   ##
=======================================
  Coverage   69.35%   69.35%           
=======================================
  Files          58       58           
  Lines       11919    11923    +4     
=======================================
+ Hits         8266     8269    +3     
- Misses       3653     3654    +1     

Flag	Coverage Δ
unittests	69.35% <75.00%> (+<0.01%)	⬆️

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[alimirjamali]

It appears that I have to write unit tests for this PR.

Should this be added to the existing Unit Test test_334_vm_create_invalid_name or a new one?

[marmarek]

Should this be added to the existing Unit Test test_334_vm_create_invalid_name or a new one?

Both options are okay (if existing one, just make sure to use separate with blocks).

[alimirjamali]

Both options are okay (if existing one, just make sure to use separate with blocks).

Done. Waiting for CI/CD pipeline